Taking the easy way out...neither. Randy Orton and John Cena's career are virtually tied together. You really can't talk about one of their careers without framing it somehow around the other's. They are each other's biggest rival, and have been for the majority of their careers so far. I really don't think you can separate them to judge who will be the bigger legend, because they are more like Yin and Yang...two polar opposites whose careers are linked at the hip.